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Question Number 156024 by alcohol last updated on 07/Oct/21

Answered by mr W last updated on 07/Oct/21

$$\underset{x\to 0}{\lim }\frac{\sqrt{1+f\left(3x\right)}}{x}$$$$=3\underset{x\to 0}{\lim }\frac{\sqrt{1+f\left(3x\right)}}{3x}$$$$=3\underset{t\to 0}{\lim }\frac{\sqrt{1+f\left(t\right)}}{t}$$$$=3l$$

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